That's card advantage value that can turn a game in your favor
Of those, the 1998 Japanese Illustrator Promotional Card maintains the record for the most expensive Pokemon Card several times over, with the most expensive of all coming in with a deal valued at over $5 million, whereby YouTuber Logan Paul exchanged a PSA 9 version of the card (valued at $1,275,000) and an additional $4 million, for the only PSA 10 version
One such card that the decks' support is the Trainer Cards, also known as Supporter Cards
These include all the starting Deck Leaders, all the Immortals, Kinetic Soldier, Arsenal Bug, Woodland Sprite, and Creature Swap
Its understandable to misread this clause as an alternate or additional casting cost rather than a condition check, but even then, all five of these cards are cognitively demanding
I hope this project has been useful to you